188 



Sediments 



Figure 161. Series of photographs at Will Rogers State Park, north end of Santa Monica Bay. showing complete 

 development of a gravel cusp, from Schupp (1953). A, bare sand, 1930 on June 26. 1952; B, thin veneer of fine gravel, 



Streams contribute a large proportion of 

 coarse sands. In contrast, the mouths of the 

 Santa Ana, Santa Margarita, San Diegueto, 

 and San Diego Rivers are marked by finer- 

 than-usual sands, perhaps in response to a 

 finer caUber of load. These relationships 

 may be purely circumstantial and the beach 



sands controlled by other factors in view of 

 the scarcity of data on stream-borne sedi- 

 ments of the region. A closer spacing of 

 samples would have revealed the presence 

 of coarse sand confined to small pocket 

 beaches like La Jolla Cove (Sample 51). An 

 example of the abihty of closely spaced sam- 



